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Cannot use an automatic index on the right table of a RIGHT JOIN because

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automatic indexes must be WHERE_IDX_ONLY, but the RIGHT JOIN post-processing
does not know how to work with an index-only scan.

FossilOrigin-Name: beb4401dc09fb68e85ddcf3f99598527691535d0eb7693168f440e5a5a076e3f
This commit is contained in:
drh
2022-04-10 23:48:47 +00:00
parent 9debb58e48
commit 529394e5c1
4 changed files with 17 additions and 9 deletions
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src/where.c
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@@ -3324,6 +3324,7 @@ static int whereLoopAddBtree(
&& HasRowid(pTab) /* Not WITHOUT ROWID table. (FIXME: Why not?) */
&& !pSrc->fg.isCorrelated /* Not a correlated subquery */
&& !pSrc->fg.isRecursive /* Not a recursive common table expression. */
&& (pSrc->fg.jointype & JT_RIGHT)==0 /* Not the right tab of a RIGHT JOIN */
){
/* Generate auto-index WhereLoops */
LogEst rLogSize; /* Logarithm of the number of rows in the table */